一下哪种工具体现“80/20法则”().
A、直方图法
B、管制图法
C、柏拉图法
D、检查法
参考答案:C
-I've gained weight these days.
-You ________ have eaten so much junk food.[ ]
A.wouldn't
B.couldn't
C.shouldn't
D.mustn't
下图是反射弧的组成示意图(虚线内为神经中枢),请据图回答:
图中的()是感受器,图中的兴奋传导方向是()(以序号作答)。